the oil wont really help much. The piston and sleeve has a tight fit, (which is good and right) so if you have a heat gun heat the bottom of the cylinder head fins and the top of the engine case. that is where the piston goes to top dead center, and by heating it up some the sleeve will expand slightly and make it easier to turn over. dont scorch it, but heat it nice and evenly by moving the heat alot around that area. if you dont have the heat gun, you can try a good hot hair dryer. then try to start it on the box and then start driving the car right away. DON'T let it idle, I repeat DO NOT IDLE the engine. that will kill your expensive new engine. you will ruin the piston/sleeve fit if it runs too cool and rich by idling it that way, because it doesnt get up to operating temp and the piston/sleeve will wear away! follow these instructions on OS website on thread "how do I break in my rc car nitro engine."

http://www.osengines.com/faq/product-faq.html#q590

and here is more reading on breakin if you want:

http://www.rcuniverse.com/forum/m_13...tm.htm#1403215